As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN DOING FIRE TEST BATTERY DISCHARGE MAINTENANCE MESSAGE APPEARED. REPLACED MAIN BATTERY PER AMM AND MAIN BATTERY CHARGER PER AMM. OPERATIONAL TEST GOOD FOR BOTH. ACCOMPLISHED FIRE TEST ALSO PRECAUTIONARY, ALL TEST GOOD. ALL INDICATIONS NORMAL.